<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>model</title>
    <script src="https://unpkg.com/vue"></script>
</head>
<body>
<div id="app">
    <a href="javascript:" @click="flag=true">登录</a>
    <a href="javascript:" @click="flag=false">注册</a>
    <login v-if="flag"></login>
    <register v-else="flag"></register>
</div>

</body>
<script>

    Vue.component('login',{
        template:'<h3>登录组件</h3>'
    });
    Vue.component('register',{
        template: '<h3>注册组件</h3>'
    });
var vm = new Vue({
    el: '#app',
    data: {
        msg: '大家好哈哈哈哈，你们好啊。',
        flag: false,
    }

})
</script>
</html>